What to use
Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 252 HP / 212 Def / 44 Spe
Bold Nature
- Volt Switch
- Hydro Pump
- Will-O-Wisp
- Pain Split
What it does: Rotom-W is one of the most popular pokemon in OU. Despite its low base stat total, it has an excellent typing, leaving it with only one weakness, five useful resistance, and thanks to Levitate, a Ground immunity, which negates the Ground weakness that its Electric typing has. Although Rotom-W has a limited movepool, making it predictable, the utility it gives to a team
Volt Switch is the first attack, and is the main reason why Rotom-W is so difficult to face, as it can gain momentum on predicted switches, as you can see what your opponent will switch in, and then bring in the appropriate counter. All the Rotom forms only have access to one STAB move on their secondary typing. In Rotom-W's case, this is Hydro Pump, which hits reasonable hard even off of Rotom-W's uninvested attack stat, although Rotom-W would definitely prefer to have Scald. Rotom-W has fairly poor coverage options, and Thunderbolt is not appreciably more powerful than Volt Switch, so Rotom-W is best just running the above two attacks. Will-O-Wisp is the best status move in the third slot, and even the threat of it will make physical attackers think twice before switching in. Thunder Wave is also an option, allowing Rotom-W to cripple the fast special attackers that often switch into it, however Will-O-Wisp is used on 90% of Rotom-W in the 1825 OU statistics, indicating that in practice, it's most likely to be the best choice. The 4th slot is generally used for a recovery move, with Pain Split is the best option, as thanks to Rotom-W's low base 50 HP stat, it can drain a lot of health out of the enemy, making this move very effective against walls. Rest + Chesto Berry is a one-time option for recovering HP, however after using Rest once, this effectively becomes a dead moveslot, while Pain Split has more utility throughout the match, allowing Rotom-W to repeatedly check pokemon.
This is the standard, safe EV spread for Rotom-W, and it was originally designed in early XY OU to outspeed maximum speed Jolly Azumarill by one point, so it could hit it with Volt Switch after it had set up Belly Drum. Maximising Rotom-W's low HP stat gives it the best bulk possible, with the remaining 212 EVs being invested in physical defense. Combined with a Bold nature, this gives Rotom-W considerable physical bulk. Max speed Azumarill is very rare now, with most sets preferring an Adamant nature for more power; in addition, Assault Vest has taken over Belly Drum as the most popular set, so it's also possible to just run 252 HP/252 Defense for maximum bulk.
Rotom-W's physically defensive set is its most common set in XY OU, as it Rotom-W to make the most effective use of its defensive typing. Rotom-W's is able to counter most sets of Talonflame, and check (but by no means counter) other Flying types paired with Talonflame; mainly Mega Pinsir. Rotom-W is also useful against Sand teams, as Tyranitar hates being burnt, and Rotom-W is immune to Sand Rush Excadrill's Earthquake, while 4x resisting Iron Head. Rotom-W can check common pokemon found on Rain teams, although it's not able to reliably shut down the whole playstyle by itself. Most physical attackers can't do too much damage to Rotom-W, as it can retailiate with Will-O-Wisp, then Pain Split to recover off some of the damage, making them easy for a teammate to finish off.
Good teammates: Rotom-W is very easy to include on teams, and will always pull its weight if thrown onto teams as a 6th member. Some popular partners include other users of Volt Switch or U-Turn, forming what's commonly known as a VoltTurn core, with Landorus-T, Scizor and Mega Manectric being common partners. Volt Switch is useful for giving safe switches into a wallbreaker, with Mega Medicham and Mega Heracross being great partners, as Rotom-W can also cover their Flying weakness. Despite Rotom-W's bulk, it shouldn't be expected to cover a team against every physical attacker, and so benefits from being paired with a faster pokemon such as Life Orb Latios, that Rotom-W can Volt Switch into, and who can in return outspeed and OHKO many targets with Draco Meteor or another move.
What counters it: Rotom-W is difficult to counter directly, as it can U-Turn out of unfavourable matchups. Mega Venusaur is perhaps the best counter, resisting both moves, not being entirely crippled by Will-O-Wisp, and can retailiate with a super effective Giga Drain. Other bulky Grass types such as Amoongus are also effective counters. Latios and Latias are also safe switchins, and if Rotom-W does not predict their switchin and use Volt Switch, then the opponent can freely fire off a Draco Meteor. Rotom-W counters normal Gyarados, but Mega Gyarados can hit Rotom-W with Earthquake, with its ability Mold Breaker negating Levitate. Choice Scarf Excadrill can also hit Rotom-W with a Mold Breaker Earthquake, as can Teravolt Kyurem-B with Earth Power. Keeping up Stealth Rocks can prevent Rotom-W from switching in with no consequences, and hitting it with Toxic will also wear it down quickly. After the Aegislash ban, certain physical attackers became more viable, or were able to forgot Earthquake in favour of another move. These pokemon include Mega Pinsir with Close Combat, Mega Heracross, Mega Medicham and Staraptor. Although these pokemon should not switch into Rotom-W, equally, Rotom-W will not enjoy switching into their very powerful neutral attacks.
Any additional info: When using Rotom-W, you need to predict what your opponent's next move might be, in order to avoid giving a free switchin for powerful special attackers. For example, if there's a matchup between an opposing Choice Scarfed Landorus-T and a Rotom-W, then if you can predict that Landorus-T will be unlikely to stay in to take Will-O-Wisp or Hydro Pump, and is likely to U-Turn out, allowing you to go for Volt Switch, despite Landorus-T being immune to the move, giving you the offensive momentum.
Since I've written this set up, I thought I'd also mention the Choice Scarf set in the 'What not to use' category.
What not to use
Rotom-Wash @ Choice Scarf
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
- Volt Switch
- Hydro Pump
- Trick
- Will-O-Wisp
What it does: Rotom-W is not a particular good user of Choice Scarf, due to its low special attack and poor coverage options. The main reason to run Choice Scarf on Rotom-W is in combination with Trick, allowing Rotom-W to utilise one support move (generally Will-O-Wisp) alongside Hydro Pump and Volt Switch. Unfortunately, Rotom-W loses out on a lot of bulk, as well as recovery from Leftovers and Pain Split. After tricking its item, Rotom-W can't reliably support the team, as it's not a particularly potent offensive threat, and without EV investment in its defenses, it's now 2HKOed by moves like Talonflame's Choice Banded Brave Bird, greatly reducing its defensive utility. This set is not terrible, as Rotom-W is one of the few OU viable pokemon with access to the combination of Trick + either Volt Switch or U-Turn, but it's worth looking at the following alternatives, as they are likely to fit your team better.
Better users of Trick: Gothitelle (gets Shadow Tag, and can still trap and threaten its targets like Ferrothorn and Mega Venusaur even after tricking away Choice Scarf or Specs), Latios + Latias (both are much stronger offensively, and have excellent coverage options)
Better special Choice Scarf users: Keldeo (can revenge kill some setup sweepers at +1 speed), Heatran (considerably more powerful, and has better coverage options)
Better Choice Scarf users, or otherwise very fast pokemon with access to U-Turn or Volt Switch: Choice Scarf Landorus-T, Assault Vest or Life Orb Tornadus-T, Mega Manectric, Choice Scarf Diggersby
Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 252 HP / 212 Def / 44 Spe
Bold Nature
- Volt Switch
- Hydro Pump
- Will-O-Wisp
- Pain Split
What it does: Rotom-W is one of the most popular pokemon in OU. Despite its low base stat total, it has an excellent typing, leaving it with only one weakness, five useful resistance, and thanks to Levitate, a Ground immunity, which negates the Ground weakness that its Electric typing has. Although Rotom-W has a limited movepool, making it predictable, the utility it gives to a team
Volt Switch is the first attack, and is the main reason why Rotom-W is so difficult to face, as it can gain momentum on predicted switches, as you can see what your opponent will switch in, and then bring in the appropriate counter. All the Rotom forms only have access to one STAB move on their secondary typing. In Rotom-W's case, this is Hydro Pump, which hits reasonable hard even off of Rotom-W's uninvested attack stat, although Rotom-W would definitely prefer to have Scald. Rotom-W has fairly poor coverage options, and Thunderbolt is not appreciably more powerful than Volt Switch, so Rotom-W is best just running the above two attacks. Will-O-Wisp is the best status move in the third slot, and even the threat of it will make physical attackers think twice before switching in. Thunder Wave is also an option, allowing Rotom-W to cripple the fast special attackers that often switch into it, however Will-O-Wisp is used on 90% of Rotom-W in the 1825 OU statistics, indicating that in practice, it's most likely to be the best choice. The 4th slot is generally used for a recovery move, with Pain Split is the best option, as thanks to Rotom-W's low base 50 HP stat, it can drain a lot of health out of the enemy, making this move very effective against walls. Rest + Chesto Berry is a one-time option for recovering HP, however after using Rest once, this effectively becomes a dead moveslot, while Pain Split has more utility throughout the match, allowing Rotom-W to repeatedly check pokemon.
This is the standard, safe EV spread for Rotom-W, and it was originally designed in early XY OU to outspeed maximum speed Jolly Azumarill by one point, so it could hit it with Volt Switch after it had set up Belly Drum. Maximising Rotom-W's low HP stat gives it the best bulk possible, with the remaining 212 EVs being invested in physical defense. Combined with a Bold nature, this gives Rotom-W considerable physical bulk. Max speed Azumarill is very rare now, with most sets preferring an Adamant nature for more power; in addition, Assault Vest has taken over Belly Drum as the most popular set, so it's also possible to just run 252 HP/252 Defense for maximum bulk.
Rotom-W's physically defensive set is its most common set in XY OU, as it Rotom-W to make the most effective use of its defensive typing. Rotom-W's is able to counter most sets of Talonflame, and check (but by no means counter) other Flying types paired with Talonflame; mainly Mega Pinsir. Rotom-W is also useful against Sand teams, as Tyranitar hates being burnt, and Rotom-W is immune to Sand Rush Excadrill's Earthquake, while 4x resisting Iron Head. Rotom-W can check common pokemon found on Rain teams, although it's not able to reliably shut down the whole playstyle by itself. Most physical attackers can't do too much damage to Rotom-W, as it can retailiate with Will-O-Wisp, then Pain Split to recover off some of the damage, making them easy for a teammate to finish off.
Good teammates: Rotom-W is very easy to include on teams, and will always pull its weight if thrown onto teams as a 6th member. Some popular partners include other users of Volt Switch or U-Turn, forming what's commonly known as a VoltTurn core, with Landorus-T, Scizor and Mega Manectric being common partners. Volt Switch is useful for giving safe switches into a wallbreaker, with Mega Medicham and Mega Heracross being great partners, as Rotom-W can also cover their Flying weakness. Despite Rotom-W's bulk, it shouldn't be expected to cover a team against every physical attacker, and so benefits from being paired with a faster pokemon such as Life Orb Latios, that Rotom-W can Volt Switch into, and who can in return outspeed and OHKO many targets with Draco Meteor or another move.
What counters it: Rotom-W is difficult to counter directly, as it can U-Turn out of unfavourable matchups. Mega Venusaur is perhaps the best counter, resisting both moves, not being entirely crippled by Will-O-Wisp, and can retailiate with a super effective Giga Drain. Other bulky Grass types such as Amoongus are also effective counters. Latios and Latias are also safe switchins, and if Rotom-W does not predict their switchin and use Volt Switch, then the opponent can freely fire off a Draco Meteor. Rotom-W counters normal Gyarados, but Mega Gyarados can hit Rotom-W with Earthquake, with its ability Mold Breaker negating Levitate. Choice Scarf Excadrill can also hit Rotom-W with a Mold Breaker Earthquake, as can Teravolt Kyurem-B with Earth Power. Keeping up Stealth Rocks can prevent Rotom-W from switching in with no consequences, and hitting it with Toxic will also wear it down quickly. After the Aegislash ban, certain physical attackers became more viable, or were able to forgot Earthquake in favour of another move. These pokemon include Mega Pinsir with Close Combat, Mega Heracross, Mega Medicham and Staraptor. Although these pokemon should not switch into Rotom-W, equally, Rotom-W will not enjoy switching into their very powerful neutral attacks.
Any additional info: When using Rotom-W, you need to predict what your opponent's next move might be, in order to avoid giving a free switchin for powerful special attackers. For example, if there's a matchup between an opposing Choice Scarfed Landorus-T and a Rotom-W, then if you can predict that Landorus-T will be unlikely to stay in to take Will-O-Wisp or Hydro Pump, and is likely to U-Turn out, allowing you to go for Volt Switch, despite Landorus-T being immune to the move, giving you the offensive momentum.
Since I've written this set up, I thought I'd also mention the Choice Scarf set in the 'What not to use' category.
What not to use
Rotom-Wash @ Choice Scarf
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
- Volt Switch
- Hydro Pump
- Trick
- Will-O-Wisp
What it does: Rotom-W is not a particular good user of Choice Scarf, due to its low special attack and poor coverage options. The main reason to run Choice Scarf on Rotom-W is in combination with Trick, allowing Rotom-W to utilise one support move (generally Will-O-Wisp) alongside Hydro Pump and Volt Switch. Unfortunately, Rotom-W loses out on a lot of bulk, as well as recovery from Leftovers and Pain Split. After tricking its item, Rotom-W can't reliably support the team, as it's not a particularly potent offensive threat, and without EV investment in its defenses, it's now 2HKOed by moves like Talonflame's Choice Banded Brave Bird, greatly reducing its defensive utility. This set is not terrible, as Rotom-W is one of the few OU viable pokemon with access to the combination of Trick + either Volt Switch or U-Turn, but it's worth looking at the following alternatives, as they are likely to fit your team better.
Better users of Trick: Gothitelle (gets Shadow Tag, and can still trap and threaten its targets like Ferrothorn and Mega Venusaur even after tricking away Choice Scarf or Specs), Latios + Latias (both are much stronger offensively, and have excellent coverage options)
Better special Choice Scarf users: Keldeo (can revenge kill some setup sweepers at +1 speed), Heatran (considerably more powerful, and has better coverage options)
Better Choice Scarf users, or otherwise very fast pokemon with access to U-Turn or Volt Switch: Choice Scarf Landorus-T, Assault Vest or Life Orb Tornadus-T, Mega Manectric, Choice Scarf Diggersby